More than twice a day for at least thirty minutes at a time. I LOVE listening to music and letting my mind wander. It's also how I come up for ideas for tabletop RPGs that I run; hit the music, imagine the scene.
I feel pretty comfortable with where I'm at right now. I got some Vengeance RAM with better timing and moved up to the i7 that was linked in this thread. If it doesn't work it is ALL YOUR FAULT, GIANTBOMB
What power supply are you getting? 1kw sounds like a lot for that machine, you could easily get away with a 750w and have room to spare. You're wasting money with a 1kw. Most I would suggest is an 850w, assuming you aren't going to be running 2 cards in the future.
Just make sure it's a good PSU - using a shitty one will kill your machine quick. Anything by Seasonic, Corsair or Coolermaster is good. I'd say go for Silver efficiency certified, Gold efficiency if you can. I have the Corsair HX850w modular PSU in my rig and it works great, and I have lots of headroom to spare.
I plan on getting a second 680 in the near future, so I went higher than I figured I would need to be safe.